(Below was written using Google Translate. I hope the message is understandable enough. If you have corrections or improvements please reply below or PM me. I can't read or write Italian so I hope the community will help me reply to people that ask questions on this topic.)

Hi xenopek! thanks for posting here!
the explanation sounds clear enough (summing up, it says to upgrade to mint 18.3, which is not affected, or to manually remove the virtualbox* pakcages, right?)
there is something i cannot follow clearly in the description of the situation at the beginning: the virtualbox guest packages may cause the guest system not to function, regardless to what system? I ask, beacuse I'm trying to figure out if these packages may be the reason why i can't complete system installation on my virtual box.
i have host linux mint 18 sarah and try to install guest windows 7 from iso. i have tried several times, but the installation of the guest system aborts without explanations after a few steps in the wizard.bsynchronization of mouse in host/guest is also unstable
thanks for your help